Aminohexahydropyrimidine-stabilized adhesive compositions



United States Patent F 3 248,243 AMINOHEXAHYDRUPYRIMIDINE-STABILIZED ADHESIVE COMPGSITIONS Edward B. Hodge and Grant J. Latterty, Terre Haute, Ind., assignors to Commercial Solvents Corporation,

New York, N.Y., a corporation of Maryland No Drawing. Filed May 17, 1962, Ser. No. 195,372 11 Claims. (Cl. 106-125) Our invention relates to adhesive compositions. More particularly our invention relates to adhesive compositions stabilized against attack by microorganisms.

Adhesive compositions are made from a wide variety of materials and have many and varied applications. Generally most adhesives are separated into three main categories: those which are of an animal origin such as the animal glues, the fish glues, and a casein pastes; those of vegetable origin such as the gums, the starch adhesives, the dextrin adhesives, the rubber latex adhesives, and the natural resin adhesives; and the synthetic adhesives such as the synthetic resins, for example, those of the ureaformaldehyde, phenol-formaldehyde, acrylic and vinyl types. All such adhesives possess one common property, the ability to enable surfaces to merge on contact or under pressure and after merger, resist separation.

A common problem of adhesive compositions is their lack of resistance to attack by certain microorganisms during storage. On certain of the widely used types of adhesives, particularly casein adhesives and starch adhesives, spoilage takes place in a matter of days. Such spoilage, which can finally cause coagulation and even separation of the adhesive, is easily observed by the formation of mold and the production of highly noxious odors.

We have now discovered a means whereby adhesive compositions can be made resistant to spoilage. Our new adhesive compositions even retain this resistance after long storage periods. Thus, our stabilized adhesive compositions are not only efiective in preventing mold formation and noxious odors but successfully inhibit decomposition, coagulation and separation of the adhesive composition itself.

Our adhesive compositions are produced by incorporating a stabilizing amount of an aminohexahydropyrimidine having the following general formula:

Nfiz \R wherein R is lower alkyl and R is alkyl into the adhesive composition.

Examples of suitable aminohexahydropyrimidines coming within the scope of our invention are -amino-l,3- bis(2 ethylhexyl) 5 methylhexahydropyrimidine, 5- amino 1,3 d'ibutyl 5 methylhexahydropyrimidine, 5- amino-l,3-diisopropyl 5 ethylhexahydropyrimidine, 5- amino-1,3,5-trimethylhexahydropyrimidine, etc., and the like.

The amount of aminohexahydropyrimidine necessary to stabilize adhesive compositions will naturally vary depending in the main on the particular adhesive to be stabilized and the conditions of storage. Usually, however, amounts as low as 100 p.p.m. by weight based on the weight of the adhesive are effective in controlling spoilage. Generally we have found that it is not necessary to exceed 1,000 p.p.m. of our stabilizing agents in the adhesive compositions. Under most circumstances satisfactory results are obtained when 250 p.p.m. to 500 p.p.m. of our stabilizers are utilized.

* cross REFERENCE Patnted Apr. 26, 1966 The following examples further illustrate our invention, but we do not intend to be limited to the procedures, types of adhesives, or amounts of aminohexahydropyrimidines set out therein. Inclusion of all equivalents obvious to the art is intended.

EXAMPLE I To test the effectiveness of our aminohexahydropyrimidines in preserving adhesive compositions, a casein adhesive composition containing 70 grams casein, 7 mls. of a 29% ammonia solution, and 623 mls. of water was divided into 5 equal portions. An aminohexahydropyrimidine stabilizing agent was added to 4 of the 5 portions, and the remaining portion was used as a control. Each of the 5 portions was then inoculated with a mold found growing in a casein-adhesive composition. Each of the 5 portions was then placed in a separate open jar and allowed to stand for 30 days. The following table shows the results of the 30-day test.

The procedure of Example I Was followed with the exception that a polyvinyl alcohol starch adhesive containing 35 grams polyvinyl alcohol, 7O grams corn starch, and 525 mls. water was utilized instead of the casein adhesive of Example I. The following table shows the results of this test.

Table 11 Amount of Aminohex- Mold Portion Aminohexahydropyrimidine ahydropy- Formarimidine, tion p.p.m.

1 5-amino-1,3-bis(2-ethylhexyD-5- 500 None.

methylhexahydropyrimidine. 2 5-arnino-1,3-dibutyl-S-methylhexa- 1,000 None.

hydropyrimidine. 3 5-amino-1,3-diisopropyl-5-ethyl- 250 None.

hexahydropyrimidine. 4 5-amino-1,3,5-trirnethylhexahy- 500 None.

dropyrirnidine. 5 Control Covered Sample.

EXAMPLE III An adhesive compound of 24 kilograms dextrin, 24 liters of water, and 10 grams of ginger grass oil was effectively stabilized by S-amino-l,3-bis(2-ethylhexyl)-5-methylhexa hydroprimidine.

EXAMPLE IV A vegetable glue adhesive composition composed of grams of gum arabic, 0.2 gram calcium hydroxide, 300 ml. of water, and 10 grams of aluminum sulfate was effectively stabilized by 5-amino-1,3-dibutyl-5-methylhexahydropyrimidine.

EXAMPLE V An adhesive composition composed of 100 grams of glue, 100 mls. of water, 5 grams of glycerin, and 3 grams SEARCH Rena of potassium bichromate was effectively stabilized by amino-l,3-diisopropyl-5-ethylhexahydropyrimidine.

EXAMPLE VI 4- organism attack which comprises an adhesive selected from the group consisting of casein adhesive, starch adhesive, glue adhesive and rubber latex adhesive and from about 250 to about 500 ppm. of an aminohexahydro- An adhesive composition composed of 17 pounds castor 5 pyrimidine having the f llowing f r ula;

oil, 100 pounds pine resin, and 50 pounds denatured alcohol was effectively stabilized by S-arnino-1,3,5-trimethylhexahydroprimidine.

Now having described our invention, what we claim is:

1. An adhesive componsition stabilized against microorganism attack which comprises an adhesive selecting from the group consisting of a casein adhesive, starch adhesive, glue adhesive and rubber latex adhesive and a stabilizing amount of an aminoheXa-hydropyrimidine having the following formula:

H2 1 O R -N \NR1 Hz-C (3H2 0 N62 \R wherein R is lower alkyl and R is alkyl.

2. The composition of claim 1 wherein the adhesive is a casein adhesive.

3. The composition of claim 1 wherein the adhesive is a starch adhesive.

4. The composition of claim 1 wherein the adhesive is a glue adhesive.

5. The composition of claim 1 wherein the adhesive is a rubber latex adhesive.

6. An adhesive composition stabilized against microorganism attack which comprises an adhesive selected from the group consisting of casein adhesive, starch adhesive, glue adhesive and rubber latex adhesive and from a about 100 to about 1,000 ppm. of an aminohexahydropyrimidine having the following formula:

Nfiz R wherein R is lower alkyl and R is alkyl.

7. An adhesive composition stabilized against micro- References Cited by the Examiner UNITED STATES PATENTS 1,925,819 9/1933 Putnam 106125 2,415,047 1/1947 Senkus 16733 2,727,012 12/1955 Treat et al. 260-29] 2,758,103 8/ 1956 Henson et a1. 260-29.7 2,837,463 6/ 1958 Fosdick et al. 16733 2,888,422 5/1959 Johnson et a1. 26029.7 3,058,835 10/1962 Sheeran l06146 3,072,529 1/ 1963 Sanders et a1. 167-33 ROBERT F. WHITE, Primary Examiner.

MORRIS LIEBMAN, ALEXANDER H.

BRODMERKEL, Examiners. 

1. AN ADHESIVE COMPONSITION STABILIZED AGAINST MICROORGANISM ATTACK WHICH COMPRISES AN ADHESIVE SELECING FROM THE GROUP CNSISTING OF A CASEIN ADHESIVE, STARCH ADHESIVE, GLUE ADHESIVE AND RUBBER LATEX ADHESIVE AND A STABILIZING AMOUNT OF AN AMINOHEXAHYDROPYRIMIDINE HAVING THE FOLLOWING FORMULA: 